If you do not get married within the 90-day period permitted by your fiancée visa, your fiancée must leave the US, and can only reenter the country if you begin the process again, petitioning for a new K-1 visa. The same requirements apply to fiancée visas that are denied.
K-1 Visa Petition Limitations
Two Visa Limit
According to the Immigration Marriage Brokers Act of 2005, a US citizen can only petition for two K1 visas.
Failed Marriage or No Marriage
If the first marriage fails or never occurs, the American petitioner must wait two years to apply for a new K-1 visa, even if it is on behalf of the same person.
Special Circumstances
In some circumstances, you will be able to apply for more than two fiancé visas, but this will require a waiver, which can be difficult to obtain.
Therefore, you are advised to work with an experienced K1 visa lawyer to ensure that your first petition for a fiancée visa is successful, and that you meet all requirements afterwards for your spouse to gain citizenship.
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